// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/utility/in_process_utility_thread.h"

#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "content/child/child_process.h"
#include "content/utility/utility_thread_impl.h"

namespace content {

// We want to ensure there's only one utility thread running at a time, as there
// are many globals used in the utility process.
static base::LazyInstance<base::Lock> g_one_utility_thread_lock;

InProcessUtilityThread::InProcessUtilityThread(
    const InProcessChildThreadParams& params)
    : Thread("Chrome_InProcUtilityThread")
    , params_(params)
{
}

InProcessUtilityThread::~InProcessUtilityThread()
{
    // Wait till in-process utility thread finishes clean up.
    bool previous_value = base::ThreadRestrictions::SetIOAllowed(true);
    Stop();
    base::ThreadRestrictions::SetIOAllowed(previous_value);
}

void InProcessUtilityThread::Init()
{
    // We need to return right away or else the main thread that started us will
    // hang.
    base::ThreadTaskRunnerHandle::Get()->PostTask(
        FROM_HERE, base::Bind(&InProcessUtilityThread::InitInternal, base::Unretained(this)));
}

void InProcessUtilityThread::CleanUp()
{
    child_process_.reset();

    // See comment in RendererMainThread.
    SetThreadWasQuitProperly(true);
    g_one_utility_thread_lock.Get().Release();
}

void InProcessUtilityThread::InitInternal()
{
    g_one_utility_thread_lock.Get().Acquire();
    child_process_.reset(new ChildProcess());
    child_process_->set_main_thread(new UtilityThreadImpl(params_));
}

base::Thread* CreateInProcessUtilityThread(
    const InProcessChildThreadParams& params)
{
    return new InProcessUtilityThread(params);
}

} // namespace content
